3DS XL turns off ~3 seconds after powering it on

Hello,

So my 3DS XL is not working :(. I've taken it apart once before to fix a charging issue, so Nintendo is not going to fix this (much bigger problem imo) for me.

Here's what happens.

- Press the power button; the blue light comes on

- The blue power indicator remains on for approximately 3-4 seconds

- The 3DS XL powers off with a short "pop" noise

- The "pop" noise plus the blue power indicator turning off are the only forms of feedback - there is absolutely no feedback from either of the screens on the device.

Any ideas what the issue could be? I've read that it might be a damaged ribbon somewhere. I fear it may be a broken mobo, but I have no clue how to check this.

Thanks,

- Nate